pointer to memory of size 'psi_size' that can be casted into a dvbpsi_decoder_t.

Creates a void pointer that points to a private dvbpsi decoder struct (eg: dvbpsi_pat_t). The first elements in this newly created decoder should contain DVBPSI_DECODER_COMMON, which corresponds to a dvbpsi_decoder_t. Upon return the pointer should be casted to the correct type. Delete the pointer with